This is an open-label, single-center, first-in-human study, designed to evaluate the safety, tolerability and pharmacokinetic (PK) profile of a single subcutaneous (SC) injection of RBP-6000 in opioid dependent subjects. Enrollment will begin with 6 subjects, and additional subjects will not be enrolled until safety through Day 4 has been reviewed and analyzed. Subjects will remain in a residential unit through Day 30 post-injection and will continue with visits to the clinical unit until Day 85 or plasma buprenorphine levels are below 100 pg/mL, whichever comes later. The expected maximum duration of participation for each subject (including screening) is 120 days.